NSTextView scrolling behavior and selecting behavior - objective-c

Question

I have an NSTextView that I'm outputting text from NSTask. Everything works as expected except the scrolling and selecting behaviors.
1: If I try to scroll up, the position of my scroll snaps back to the bottom instantly after I let go. Any ideas? I've looked through quite a bit of documentation about this and can't find anything about it.
2: If I select text, it removes it. I just want it to select so I can copy and paste. Lost on this one too.
Any tips or pointers would be most welcome. Thanks.
- (id)init
{
[super init];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(readPipe:)
name:NSFileHandleReadCompletionNotification
object:nil];
return self;
}
- (void)kicked
{
task = [[NSTask alloc] init];
[task setLaunchPath:[self.kickLocationTextField stringValue]];
[task setArguments:kickBuild];
NSPipe *pipe = [[NSPipe alloc] init];
fileHandle = [pipe fileHandleForReading];
[fileHandle readInBackgroundAndNotify];
[task setStandardOutput:pipe];
[task setStandardError:pipe];
[task launch];
[task release];
[pipe release];
}
- (void)readPipe:(NSNotification *)notification
{
NSData *data;
NSString *text;
if( [notification object] != fileHandle )
{
return;
}
data = [[notification userInfo] objectForKey:NSFileHandleNotificationDataItem];
text = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
[nsTaskOutput insertText:text];
[text release];
if (data != 0)
{
[fileHandle readInBackgroundAndNotify];
}
}

Answer 1

Try this instead of insertText::
NSScroller *scroller = nTaskOutput.enclosingScrollView.verticalScroller;
BOOL shouldScrollToBottom = scroller.doubleValue == 1.0;
NSTextStorage *ts = nTaskOutput.textStorage;
[ts replaceCharactersInRange:NSMakeRange(ts.length, 0) withString:text];
if (shouldScrollToBottom) {
NSRect bounds = nTaskOutput.bounds;
[nTaskOutput scrollPoint:NSMakePoint(NSMaxX(bounds), NSMaxY(bounds))];
}